CAMPBELL'S SOIL CULTURE MANUAL 



39 



commonly considered, but of equal importance that of 

 the more ready admission of the air which is in two ways 

 very advantageous, that of more quickly warming the soil 

 and promoting a more ready chemical action necessary 

 to the development of fertility. 



THE DISK AFTER HARVEST. 



In still another season of the year we find the disk of 

 equal value, that is immediately after the small grain 



Following Harvester with the Disk, a very profitable part of the 

 Campbell system. 



or any other crop is removed. It is advised whenever 

 possible to follow behind the harvester and not allow 

 the soil to be exposed a single day to the sun's rays after 



